Skills to know if you own a chainsaw: How to adjust the chain tension, how to sharpen the teeth. They say you should sharpen the teeth/chain, every time you replenish the fuel and bar oil. Also to find out what sharpener file to get you can look at the bar and it has the chain size written on it. For example this one the Stihl MS170 may say on the bar “3/8P” Which means basically the diameter of the file you use to sharpen it is 4mm or 3/8ths of an inch.
The prototype’s maiden flight had a tail-dragger undercarriage.
The ME262 jet engines like all jet engines today, required proper materials for the combustion chamber in particular and other parts like the compressor blades. These were metals in short supply and a tenuous supply was available from a neutral country which at any time may have withdrawn access. So the jet designers tried alternative combustion chamber materials. including some kind of insulating resins or pastes that could be applied to the inside of the chamber. These achieved limited success.
Houses today are much the same as they were then. Other materials were used, but achieved often the same result as today. For example, kitchens today have painted walls – usually acrylic paint. Back then they often used lime on kitchen walls, it made them powdery-white and could be re-done every so often as desired. If you look closely at the characteristics of methods of the olden-times, you often can see secondary benefits, such as how lime may disinfect the kitchen walls to some degree as well as making them look clean and reflect a lot of light.
There was no modern technology – not even electricity. Yet solutions to every-day problems were in place, such as a candle or a lamp instead of an electric light or a horse and buggy or stage coach instead of a motor car. Basically just about every problem has a solution, for example, no refrigeration, but cellars kept things cool and preservation techniques such as canning, small goods. smoking or drying foods were widely used.